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Zinc Ion

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Question

To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of $N H_{4} O H$ . However,when $H C l$ is added to the original solution, a white precipitate is formed. The solution contained :

A

lead salt

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B

silver salt

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C

mercurous salt

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D

copper salt

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Solution

The correct option is C mercurous salt
The solution contains mercurous salt. $H g_{2} C l_{2}$ is white insoluble salt.
$H g_{2} C l_{2} + 2 N H_{4} O H ⟶ H g + H g O . H g (N H_{2}) C l      B l a c k + N H_{4} C l + 2 H_{2} O$

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Similar questions

Q. (a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. Name the metal ion present in solution A.
(b) When ammonium hydroxide is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide to give an inky blue solution. Name the cation present in solution B. What is the probable colour of solution B?

A colorless solid (A), when placed into water, produces heavy white turbidity to (B). Solid (A) gives a clear solution in

c o n c . H C l

H C l

solution is added to large amounts of water, (B) forms again. (B) dissolves in dilute HCl. When

H_{2} S

is passed through a suspension of (A) or (B); a black precipitate (C) forms, (C) is insoluble in yellow ammonium sulphide

(N H_{4})_{2} S

C o n c . H_{2} S O_{4}

added to solid (A) liberates gas (D). Gas(D) is water-soluble and gives white precipitate with mercuric salts (E) and not mercuric salts. The black precipitate (C) dissolves in

H N O_{3}

(1:1) to give a solution to which

H_{2} S O_{4}

is added followed by addition of

N H_{4} O H

when a white precipitate (F) is formed. (E) gives a black ppt. (G) with a solution of sodium stannite.

Compound B is not soluble in:

Q. Identify the inorganic salt

A

whose aqueous solution gives following reactions.
(i) pale yellow precipitate with

A g N O_{3}

solution, insoluble in dil

H N O_{3}

(ii) white precipitate with

N H_{4} O H

N a O H

solution. However the precipitate does not dissolve in excess of

N H_{4} O H

but soluble in excess of

N a O H

.

Q. Identify the cations in each of the following cases :
(i)

N a O H

solution when added to the Solution (A) gives a reddish brown precipitate.
(ii)

N H_{4} O H

Solution when added to the Solution (B) gives white precipitate which does not dissolve in excess.
(iii)

N a O H

Solution when added to Solution (C) gives white precipitate which is insoluble in excess.

When ammonium hydroxide is added to solution B, a pale blue precipitate is formed . This pale blue precipitate dissolves in excess of ammonium hydroxide giving an inky blue solution. Name the cation present in solution B.

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